Hello, I'm a small animal veterinarian and I can try to help answer your question about Gerry.
Sorry to hear something has spooked him. Is his cage located near a window? Do you live in the city where some noise could have scared him?
Have there been any visitors (house guests) over the last 24 hours?
I've also heard of wild animals such as raccoons getting into homes through pet doors and doing harm to caged parrots.
Has Gerry ever been spooked by thunder storms? They can sense the changes in barometric pressure and he could be anticipating a storm.
Looks like you have tried covering his cage with a towel ... which is my 1st suggestion. Cover it all the way so he cannot see out of his cage anywhere. Turn some music on low or the television ... whatever sound he's most used to hearing to sooth him.
Other things to consider would be new pieces of furniture, hanging coats ... brightly colored items in the room.
Please feel free to respond so I can try to assist further.
HI I CCHECKED ALL THOSE THINGS I AM IN LONDON HE IS DOING IT STILL THIS MORNIBG AND I HEARD HIM DURING THE NIGHT ITS LIKE HIS SEEING A GHOST THEN HIS FINE I AM A NERVES RACK DO YOU THINK HIS HAVING FITS AS I SAID HE SUDDENLY DIPS DOWN LOOKING UP LIKE SCARED ABOUT TO TAKE OF IS GOING TO FALL OF HIS PERCH LIKE BUT HASNT THEN HIS OK HIS EATING DRINKING AND LOUD